[sdiy] Modelling the LM13700 bias input in LTSpice

[Tom Wiltshire]

Hi All,

If I want to do some experiments in simulation, using different current sources to feed the pin1/16 bias input of the LM13700, how should I model the 13700’s input?

I don’t particularly need to model the whole chip, but I need the input to respond realistically. If modelling the whole chip is the best way, where do I find a good LM!34700 model? I’ve read various places that the input is two diode drops above the negative power rail, and other places that it’s a diode drop above ground. And what about its impedance? What does that look like?

Thanks,
Tom


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